Resource selection for control signaling in radio access network

ABSTRACT

There is disclosed a method of operating a user equipment in a radio access network, the user equipment being configured with a transmission resource pool. The transmission resource pool comprises resources for transmission of response control signaling by the user equipment. The method comprises transmitting response control signaling utilising a resource structure, the resource structure being selected from the transmission resource pool based on a signaling characteristic of characterising signaling, the resource structure further being selected based on selection control information included in a received selection control message.The disclosure also pertains to related devices and methods.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is continuation of U.S. National Stage patentapplication Ser. No. 16/646,068, filed on Mar. 10, 2020, entitledRESOURCE SELECTION FOR CONTROL SIGNALING IN RADIO ACCESS NETWORK, whichclaims priority to International Application No.: PCT/SE2017/050893,filed Sep. 11, 2017 entitled RESOURCE SELECTION FOR CONTROL SIGNALING INRADIO ACCESS NETWORK, the entireties of both of which are incorporatedherein by reference.

TECHNICAL FIELD

This disclosure pertains to wireless communication technology, inparticular in a radio access network (RAN), e.g. in a 5th Generation RANlike New Radio (NR) or LTE Evolution (LTE Rel. 15 or later).

BACKGROUND

Modern wireless networks are developed to serve a wide range of usecases and applications, requiring a high level of flexibility of thesystem. However, flexibility usually requires a lot of information to beexchanged for controlling the flexibility, leading to a high level ofsignaling overhead. There are required new approaches of controlsignaling, allowing flexibility at low cost in overhead.

SUMMARY

It is an object of the present disclosure to provide approaches ofhandling control signaling efficiently, with low overhead. Theapproaches are particularly advantageously implemented in a 5thGeneration (5G) telecommunication network or 5G radio access technologyor network (RAT/RAN), in particular according to 3GPP (3^(rd) GenerationPartnership Project, a standardisation organization). A suitable RAN mayin particular be a RAN according to NR, for example release 15 or later,or LTE Evolution.

Accordingly, there is described a method of operating a user equipmentin a radio access network, the user equipment being configured with atransmission resource pool. The transmission resource pool comprisesresources for transmission of response control signaling by the userequipment. The method comprises transmitting response control signalingutilising a resource structure, the resource structure being selectedfrom the transmission resource pool based on a signaling characteristicof characterising signaling, the resource structure further beingselected based on selection control information included in a receivedselection control message. Instead of a user equipment, a respondingradio node may be considered, e.g. in a backhaul scenario.

Moreover, a user equipment for a radio access network is proposed, theuser equipment being configured with a transmission resource pool. Thetransmission resource pool comprises resources for transmission ofresponse control signaling by the user equipment. The user equipment isadapted for transmitting response control signaling utilising a resourcestructure, the resource structure being selected from the transmissionresource pool based on a signaling characteristic of characterisingsignaling, the resource structure further being selected based onselection control information included in a received selection controlmessage. Instead of a user equipment, a responding radio node may beconsidered. The user equipment (or responding radio node) may comprise,and/or be adapted for utilising, processing circuitry and/or radiocircuitry, in particular a transmitter and/or transceiver and/orreceiver, for such transmitting, and/or for selecting the resourcestructure, and/or for being configured and/or receiving thecharacterising signaling and/or the selection control message,respectively. Alternatively, or additionally, the user equipment orresponding radio node may comprise a corresponding transmitting moduleand/or selecting module and/or receiving module and/or configuringmodule, respectively.

There is also discussed a method of operating a radio node in a radioaccess network. The method comprises receiving response controlsignaling from a responding radio node, the responding radio node beingconfigured with a transmission resource pool. The transmission resourcepool comprises resources for transmission of response control signalingby the responding radio node. The method comprises receiving responsecontrol signaling from the responding radio node utilising a resourcestructure, the resource structure being selected based on thetransmission resource pool and based on a signaling characteristic ofcharacterising signaling, the resource structure further being selectedbased on selection control information included in a selection controlmessage transmitted to the responding radio node. The radio node may bereferred to as receiving radio node.

A radio node for a radio access network may be considered, the radionode being adapted for receiving response control signaling from aresponding radio node, the responding radio node being configured with atransmission resource pool. The transmission resource pool comprisesresources for transmission of response control signaling by theresponding radio node. The radio node is adapted for receiving responsecontrol signaling from the responding radio node utilising a resourcestructure, the resource structure being selected based on thetransmission resource pool based on a signaling characteristic ofcharacterising signaling. The resource structure further is selectedbased on selection control information included in a selection controlmessage transmitted to the responding radio node. The radio node may bereferred to as receiving radio node. The radio node may comprise, and/orbe adapted for utilising, processing circuitry and/or radio circuitry,in particular a receiver and/or transceiver and/or transmitter, forreceiving the response control signaling, and/or for selecting theresource structure, and/or for configuring the responding radio node,and/or for transmitting the characterising signaling and/or theselection control message.

Receiving response control signaling utilising a resource structure maycomprise assuming that signaling received on the resource structurerepresents the response control signaling, and/or scheduling operationaccordingly. For example, demodulation and/or decoding and/or processingof signaling, and/or tuning of radio circuitry, may be performedaccordingly. It should be noted that the resource structure forreceiving may differ from the resource structure utilised by theresponding radio node, due to communication direction shift and/ortiming shift. However, the resource structure may be determined based oneach other, respectively are related to each other isomorphically, as iswell known in the field.

A responding radio node may be a user equipment, or in some cases, e.g.in backhaul scenarios, it may be a network node. A radio node, inparticular a receiving radio node, may be a network node. However, insome scenarios, e.g. sidelink communication, the radio node may be auser equipment. The response control signaling may in particular beuplink signaling, or in some variants it may be sidelink signaling. Thecharacterising signaling may in particular be downlink signaling, inparticular if the response control signaling is uplink signaling, as maybe the signaling carrying the selection control message. However, insome variants, the characterising signaling and/or the signalingcarrying the selection control message may be sidelink signaling. Inbackhaul scenarios, e.g. with radio communication between network nodes,different or similar terminology regarding the communicationdirections/the signaling may be used.

The approaches described herein may generally facilitate low overhead inparticular in cases in which a transmission resource pool is configured.The signaling characteristic may be used to implicitly indicate a rangeor subpool of resources in the transmission resource pool from which toselect the resource structure. The selection control information mayselect (or indicate for selection) the specific resource structure to beused. Accordingly, a wide range of options for resource structures maybe configured in the transmission resource pool, but the overhead forselecting specific resources (e.g., dynamically selecting them, inparticular with physical layer control signaling like DCI signaling) maybe limited. In other perspective, the signaling characteristic mayindicate a coarse selection of possible resource structures, e.g. agroup of resource structures, and the selection control information mayprovide fine selection, e.g. of a specific resource structure. Theapproaches may be particularly advantageous in the context of aninformation system, as they allow easy and efficient adaption torequirements of such systems, in particular of upstream requirements onhandling of data signaling with the air interface.

A resource pool generally may indicate and/or comprise resources, inparticular time-frequency resources, e.g. time and frequency intervals,which may be contiguous or interrupted, and/or code resources. Aresource pool may in particular indicate and/or comprise resourceelements and/or resource blocks, e.g. PRBs. A radio node like a userequipment may be considered to be configured with a resource pool if itreceived corresponding control signaling configuring it therewith. Suchcontrol signaling may in particular be transmitted by a receiving radionode as described herein. The control signaling may in particular behigher layer signaling, e.g. MAC and/or RRC signaling, and/or may besemi-static or semi-persistent. In some cases, the responding radio nodeor user equipment may be considered configured with a resource pool, ifit is informed about a corresponding configuration, e.g. that it mayaccess resources in the pool for transmitting. Such a configuration insome cases may be predefined, e.g. based on a standard and/or defaultconfiguration. A resource pool may be dedicated to one responding radionode or user equipment, or in some cases shared between several. It maybe considered that a resource pool may be general, or for specific typesof signaling, e.g. control signaling or data signaling. A transmissionresource pool may in particular be for control signaling, e.g. uplinkcontrol signaling and/or sidelink control signaling, and/or may bededicated to the user equipment/responding radio node. It may beconsidered that a resource pool comprises a plurality of resourcestructures, which may be arranged in subpools or groups, e.g. pertainingand/or according to type of (received or scheduled) signaling or type ofresponse control signaling. Each group or subpool may comprise a numberof resource structures, wherein the number may be representable by anindicator and/or bit field of the selection control information. Forexample, the maximum number of resource structures in a group maycorrespond to the maximum number of different values representable bythe bit field or indicator. Different groups may have different numbersof resource structures. It may generally be considered that a groupcomprises a smaller number of resource structures than representable bythe indicator or bit field. A resource pool may represent a search spaceand/or space of availability of resources and/or resource structuresavailable for specific signaling. In particular, a transmission resourcepool may be considered to represent a (time/frequency and/or code)domain or space of resources available for response control signaling.

A signaling characteristic may represent resources and/or resourcestructures in a reception resource pool, which may be different from thetransmission resource pool. Resources and/or resource structuresrepresenting signaling characteristics of characterising signaling, inparticular downlink (or sidelink) control signaling, and/or acorresponding pool, may in particular comprise one or more CORESETs(COntrol REsource SETs), each of which may represent a group or subpool.A CORESET may be associated to a specific time interval, in particularin a transmission timing structure like a slot, e.g. one or moresymbols. It may be considered that a first CORESET is configured for the1, 2, or 3 first symbols in a slot. A second CORESET may be configuredfor one or more later symbols, e.g. the 5th and/or 6th symbol of thesame slot. In this case, the second CORESET may in particular correspondto mini-slot related signaling, e.g. comprise resource structuresassociated to short (e.g., 1 or 2 symbols) response control signaling,and/or a short latency requirement (e.g., 1 or 2 symbols), and/orreceived or scheduled transmission in a mini-slot and/or in response toa mini-slot, e.g. mini-slot data signaling. The first CORESET may beassociated to slot-based signaling, e.g. long data signaling (e.g.,longer than 2, 3 or 4 symbols), and/or response control signaling withrelaxed latency requirement (e.g., more than 1 or 2 symbols, and/orallowing transmission in a later transmission timing structure like alater slot or subframe), and/or long response control signaling, e.g.longer than 2 or 3 or 4 symbols. Generally, different CORESETs may beseparated in time domain by at least 1 symbol, in particular by 1, 2, 3or 4 symbols. However, in some cases, the CORESETs, and/or moregenerally, subpools, may overlap or be neighbored in time. Depending inwhich of the groups or subpools, in particular CORESETs, characterisingsignaling is received, it may be associated to a specific subpool orgroup of the transmission resource pool. A reception resource pool maybe predefined and/or configured to the responding radio node, e.g. bythe receiving radio node, which may alternatively or additionallyconfigure the transmission resource pool. Pool configuration maygenerally be predefined, or performed by the network or a network node(e.g., a receiving radio node), or another responding radio node takingthe corresponding functionality and/or also operating as a receivingradio node, e.g. in sidelink communication (in which the configurationmay be performed by another UE, or the network/network node).

Generally, the selection of the resource structure for transmission ofresponse control signaling may be based on the signaling characteristicsuch that a group or subpool of the transmission resource pool isselected based on the signaling characteristic of the characterisingsignaling, in particular based on which group and/or subpool and/orCORESET of a reception resource pool the characterising signaling isreceived (and/or scheduled for reception in some cases).

A resource structure may represent time and/or frequency and/or coderesources. In particular, a resource structure may comprise a pluralityof resource elements, and/or one or more resource blocks/PRBs. To aresource structure, there may be associated a type of signaling, inparticular control signaling, and/or a signaling format, and/or alatency requirement. A latency requirement may in particular definewhen, after receiving signaling, the response has to be transmitted,e.g. with delay that may allow for processing. The requirement maydefine a delay of 1 symbol or 2 symbols between the end of the receivedsignaling and the transmission of response control signaling, inparticular acknowledgement signaling pertaining to the receivedsignaling, e.g. data signaling. A resource structure may correspond toresources in the transmission resource pool. Different resourcestructures may differ in at least one resource element. Resourcestructures may be arranged and/or grouped in the transmission resourcepool, e.g. according to a configuration, which may be a higher layerconfiguration, e.g. based on MAC or RRC signaling. Short responsecontrol signaling may generally be associated to a short format, e.g.short PUCCH or short PSCCH, e.g. according to NR standardisation, ifapplicable. Long response control signaling may generally be associatedto a long format, e.g. long PUCCH or long PSCCH.

Signaling may be considered to carry a message and/or information, ifthe message and/or information is represented in the (modulated)waveform of the signaling. In particular, extraction of a message and/orinformation may require demodulation and/or decoding of the signaling.Information may be considered to be included in a message if the messagecomprises a value and/or parameter and/or bit field and/or indication orindicator representing the information, or more than one or acombination thereof. Information included in such a message may beconsidered to be carried by the signaling carrying the message, and viceversa. A signaling characteristic, however, may pertain to acharacteristic accessible without demodulation and/or decoding, and/ormay be determined or determinable independent thereof. However, in somecases it may be considered that signaling is demodulated and/or decodedto determine whether the characteristic is associated to specificsignaling, e.g. if the resources characterising the signaling actuallybelong to control signaling and/or to signaling intended for theresponding radio node or user equipment. Also, in some cases, thecharacteristic may be provided as information in a message, inparticular if the characterising signaling is not carrying the selectioncontrol message. Generally, selection of the resource structure may bebased on one or more than one signaling characteristics. A signalingcharacteristic may in particular represent one or more resources, inparticular in time domain, e.g. beginning and/or end and/or duration ofthe signaling, e.g., represented in symbol/s, and/or frequency range orresources of the signaling, e.g. represented in subcarrier/s, and/ornumerology of the signaling, in particular of data signaling like PDSCHsignaling or PSSCH signaling. In some cases, the characteristic mayindicate a message format, e.g. a format of the selection controlmessage, for example an associated DCI or SCI format. It may generallybe considered that a signaling characteristic represents and/orindicates a DCI format and/or search space (e.g., reception pool) and/orcode, e.g. scrambling code, and/or an identity, e.g. one of differentidentities (like R-NTI or C-NTIs) assigned to the responding radio nodeor user equipment. Characterising signaling may be scrambled based onsuch identity.

Characterising signaling, and/or signaling carrying the selectioncontrol message (which may be control signaling), and/or the responsecontrol signaling may be associated to the same carrier and/or bandwidthpart and/or carrier aggregation. However, in some cases, the signalingmay be associated to different carriers and/or bandwidth parts and/orcarrier aggregations, in particular in FDD scenarios. Characterisingsignaling and signaling carrying the selection control message may havethe same or different numerology. The numerology of the response controlsignaling may be the same or different from the numerology/ies of thecharacterising signaling and/or signaling carrying the selection controlmessage.

Response control signaling may be of and/or represent one or more of thetypes of mini-slot signaling or slot-based signaling, and/or signalingin response to types of received or scheduled signaling, which may forexample be slot-based or mini-slot based, and/or signaling having aspecific format, for example long transmission or short transmission(e.g., long PUCCH or short PUCCH or mini-slot PUCCH, or equivalentPSCCH), and/or types of content, e.g. feedback signaling and/oracknowledgement signaling and/or scheduling requesting signaling and/ormeasurement reporting (respectively, it may carry corresponding messagesand/or information). Different types of response control signaling mayin particular have different formats and/or different lengths in timedomain. The signaling type may be determined based on the signalingcharacteristic of the characterising signaling and/or based oninformation in the selection control message.

Control signaling may be considered in response to received signalingand/or a received message, if it is scheduled and/or indicated thereby,and/or if it is based on evaluating (e.g., decoding and/or demodulatingand/or measuring) the received signaling and/or message. Responsecontrol signaling may be in response to one or more than one (receivedor scheduled) signalings/messages. For example, a scheduling request maybe transmitted based on a selection control message and a characteristicof the signaling carrying it alone. Acknowledgment signaling may bebased on a received selection control message and data signalingscheduled therewith. A selection control message may comprise controlinformation and/or may be carried by control signaling. A selectioncontrol message may comprise information scheduling other signalingand/or messages, in the same communication direction (e.g., datasignaling, like PDSCH signaling) and/or in the opposite direction, forexample control signaling like acknowledgement signaling, which maypertain to (also scheduled) data signaling. A selection control messagemay comprise other control information, e.g. related to power control,like a Transmission Power Control command (TPC command) and/or MCSinformation, etc. A selection control message scheduling data signalingmay in particular include information representing one or more signalingcharacteristics thereof. In some variants, the selection control messagemay be a carried by PDCCH signaling, or PSCCH signaling in othervariants.

Selection control information may comprise and/or be represented by atleast on indication, e.g. a bit field or indicator or parameter orvalues, which may comprise and/or consist of a number of bits, e.g. 2(allowing for example groups of up to 4 resource structures) or 3.

The transmission resource pool may comprise at least two differentsubpools, wherein different subpools may comprise resources fordifferent types of response control signaling. A subpool may be seen asa group of (different) resource structures. At least one subpool may beassociated to mini-slot signaling, which may be in response to areceived mini-slot and/or for low-latency response (e.g., latencysmaller than 4 or 3 or 2 symbols) and/or for transmission of signalingin a mini-slot and/or for short transmission format, e.g. short PUCCH orshort PSCCH transmission (e.g., lasting 1, 2 or 3 symbols in time). Atleast one subpool may be associated to slot-based signaling, which maybe associated to a long transmission format (e.g., longer than a shortformat, and/or having 4 symbols or longer in time domain) like longPUCCH or long PSCCH transmission, and/or for MBB (Mobile BroadBand)transmission and/or in response to a long transmission (e.g., slot-basedor covering at least 3, or 4 or more symbols), e.g. a long datasignaling transmission, for example on a data channel, e.g. a sharedchannel like PDSCH or PSSCH, and/or a dedicated channel. Each subpoolmay comprise a number of resource structures equal to or larger than 1,in particular 1, 2, 3 or 4, or in some cases 8. Different subpools maycomprise different numbers of resource structures. The (maximum) numberof resource structures may be representable and/or representable byselection control information.

It may be considered that the signaling characteristic of characterisingsignaling characterises, e.g. indicates and/or represents, a resource orresources of the characterising signaling, in particular end and/orstart and/or a reference point of the signaling in time and/or frequencydomain, for example in symbols and/or subcarriers. A reference point maybe a point based on which the characteristic may be determined, and/orwhich characterises the resource/s of the signaling characteristic.

The selection control message may be carried by the characterisingsignaling. In this case, the characterising signaling may be controlsignaling like downlink control signaling or sidelink control signaling,in particular on PDCCH or PSCCH, respectively. The selection controlmessage may be a DCI message or SCI message, accordingly.

However, in some variants, characterising signaling may in particular bedata signaling, e.g. signaling on a shared or dedicated channel, inparticular PDSCH or PSSCH. In this case, it may be considered that thesignaling carrying the selection control message and the characterisingsignaling are different from each other. In some variants, a signalingcharacteristic of the characterising signaling may be represented by,and/or determined based on, information in the selection controlmessage.

Examples for DCI or SCI messages may comprise a scheduling assignment(also referred to as DL assignment), which may schedule the responsecontrol signaling and/or data signaling to which the response controlsignaling may pertain, in particular for acknowledgement signaling.

Generally, the response control information may be transmitted inresponse to the selection control message and/or in response to thecharacterising signaling. Thus, either or both may be taken intoaccount, and scenarios with missing characterising signaling (e.g., dueto transmission problems) may be covered as well, for example withsuitable acknowledgement signaling.

The signaling characteristic may be included and/or indicated in amessage carried by control signaling, for example in the form ofcorresponding information. In particular, the information may berepresented by an indication and/or indicator and/or bit field and/orparameter and/or value. The control signaling may be different from thecharacterising signaling, in particular associated to, and/ortransmitted on, a different channel, e.g. a control channel, whereas thecharacterising signaling may be transmitted on and/or associated to adata channel.

It may be considered that the resource structure is selected based onthe type of response control signaling to be transmitted, and/or basedon the type of signaling it is in response to. The type may beassociated to the subpool and/or resource structure selected.

In general, a group or subpool of the transmission resource pool may beselected by, and/or indicated by, the signaling characteristic. Theresource structure of the selected group or subpool may be selected by,and/or indicated by, the selection control information in the selectioncontrol message.

In some cases, the selection control message is a downlink controlinformation message, wherein optionally the characterising signalingcarries the downlink control information message. In the latter case,the signaling characteristic may be a signaling characteristic of thedownlink control signaling, e.g. location (in time/frequency domain) orresources used for transmitting the message, and/or of receiving it.

The selection control message may indicate the signaling characteristicof the characterising signaling, which may be different from thesignaling carrying the selection control message.

The characterising signaling may in particular carry data, and/or bedata signaling. Such data signaling may in particular be associated to ashared data channel like a PDSCH or PDSCH, or a dedicated channel. Datasignaling may generally be associated to a channel for MBB and/or URLLCcommunication, e.g., for downlink signaling, or for sidelink or backhaulcommunication.

There is also described a program product comprising instructionsadapted for causing processing circuitry to control and/or perform amethod as described herein.

Also, a carrier medium arrangement carrying and/or storing a programproduct as described herein is described.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings are provided to illustrate concepts and approachesdescribed herein, and are not intended to limit their scope. Thedrawings comprise:

FIG. 1, showing an example of selection of resource structures;

FIG. 2, showing an exemplary radio node implemented as user equipment;and

FIG. 3, showing an exemplary radio node implemented as network node.

DETAILED DESCRIPTION

There are described approaches with reference to an assumed channelstructure, e.g. for NR. However, the approaches are applicable to other,similar channel structures and/or RANs.

FIG. 1 shows schematically (in particular, not to scale) atime/frequency diagram t-f, which may for example represent an NRtransmission timing structure like a slot, with 14 symbols (notexplicitly shown), as seen by a user equipment or responding radio node.A reception resource pool may be configured, which in the example maycomprise a first CORESET C1 and a second CORESET C2. C1 may beconfigured for the first 3 symbols of the slot, C2 later, e.g. for the5th and 6th symbols, or other symbols. A transmission resource pool TRPis also configured, which may comprise a first subpool SP1 and a secondsubpool SP2. In the example, each subpool comprises 4 resourcestructures usable for associated control signaling. If a downlinkcontrol information message (e.g., PDCCH signaling) is received in C1, aresource structure from SP1 is used for response control signaling. Thedownlink control information message represents a selection controlmessage. If a corresponding message is received in C2, a resourcestructure from SP2 is used for response control signaling. The selectioncontrol message/downlink control information message comprises anindicator selecting which resource structure in the subset is to beused. In the example, the indicator has a bit size of (at least) 2 bit,to be able to select between 4 resource structures per subpool. Othersetups may be considered. The receiving radio node (e.g., base stationor eNB or gNB) is aware of the selected resource structure, as itprovides the corresponding selection control message, or is informedaccordingly by the network. Thus, it may receive the response controlsignaling utilising the corresponding resource structure. The responsecontrol signaling may be in response to the selection control messageonly, or may be in response to data signaling scheduled, e.g., with theselection control message. In this case, instead or additional to thesignaling characteristic of the selection control message (the CORESETit is associated to), a signaling characteristic of the data signalingmay be used, e.g. the end of the signaling in time domain, e.g. the lastsymbol of PDSCH signaling, and/or start and/or length of the signaling.It should be noted that this characteristic, or information indicatingit, may be indicated in the selection control message, or in anothermessage, which may be a message carried in control signaling, e.g.another downlink control information message, or a message carried inhigher layer signaling.

The solid arrows in FIG. 1 indicate the mapping from CORESET to subpool,the dashed lines indicate schematically when the response controlsignaling having the selected resource structure is transmitted.

It should be noted that, generally, any kind of response controlsignaling will be transmitted after reception of the selection controlmessage.

FIG. 2 schematically shows a radio node, in particular a terminal orwireless device 10, which may in particular be implemented as a UE (UserEquipment). Radio node 10 comprises processing circuitry (which may alsobe referred to as control circuitry) 20, which may comprise a controllerconnected to a memory. Any module of the radio node 10, e.g. acommunicating module or determining module, may be implemented in and/orexecutable by, the processing circuitry 20, in particular as module inthe controller. Radio node 10 also comprises radio circuitry 22providing receiving and transmitting or transceiving functionality(e.g., one or more transmitters and/or receivers and/or transceivers),the radio circuitry 22 being connected or connectable to the processingcircuitry. An antenna circuitry 24 of the radio node 10 is connected orconnectable to the radio circuitry 22 to collect or send and/or amplifysignals. Radio circuitry 22 and the processing circuitry 20 controllingit are configured for cellular communication with a network, e.g. a RANas described herein, and/or for sidelink communication. Radio node 10may generally be adapted to carry out any of the methods of operating aradio node like terminal or UE disclosed herein; in particular, it maycomprise corresponding circuitry, e.g. processing circuitry, and/ormodules.

FIG. 3 schematically show a radio node 100, which may in particular beimplemented as a network node 100, for example an eNB or gNB or similarfor NR. Radio node 100 comprises processing circuitry (which may also bereferred to as control circuitry) 120, which may comprise a controllerconnected to a memory. Any module, e.g. transmitting module and/orreceiving module and/or configuring module of the node 100 may beimplemented in and/or executable by the processing circuitry 120. Theprocessing circuitry 120 is connected to control radio circuitry 122 ofthe node 100, which provides receiver and transmitter and/or transceiverfunctionality (e.g., comprising one or more transmitters and/orreceivers and/or transceivers). An antenna circuitry 124 may beconnected or connectable to radio circuitry 122 for signal reception ortransmittance and/or amplification. Node 100 may be adapted to carry outany of the methods for operating a radio node or network node disclosedherein; in particular, it may comprise corresponding circuitry, e.g.processing circuitry, and/or modules. The antenna circuitry 124 may beconnected to and/or comprise an antenna array. The node 100,respectively its circuitry, may be adapted to perform any of the methodsof operating a network node or a radio node as described herein; inparticular, it may comprise corresponding circuitry, e.g. processingcircuitry, and/or modules. The radio node 100 may generally comprisecommunication circuitry, e.g. for communication with another networknode, like a radio node, and/or with a core network and/or an internetor local net, in particular with an information system, which mayprovide information and/or data to be transmitted to a user equipment.

References to specific resource structures like transmission timingstructure and/or symbol and/or slot and/or mini-slot and/or subcarrierand/or carrier may pertain to a specific numerology, which may bepredefined and/or configured or configurable. A transmission timingstructure may represent a time interval, which may cover one or moresymbols. Some examples of a transmission timing structure aretransmission time interval (TTI), subframe, slot and mini-slot. A slotmay comprise a predetermined, e.g. predefined and/or configured orconfigurable, number of symbols, e.g. 6 or 7, or 12 or 14. A mini-slotmay comprise a number of symbols (which may in particular beconfigurable or configured) smaller than the number of symbols of aslot, in particular 1, 2, 3 or 4 symbols. A transmission timingstructure may cover a time interval of a specific length, which may bedependent on symbol time length and/or cyclic prefix used. Atransmission timing structure may pertain to, and/or cover, a specifictime interval in a time stream, e.g. synchronized for communication.Timing structures used and/or scheduled for transmission, e.g. slotand/or mini-slots, may be scheduled in relation to, and/or synchronizedto, a timing structure provided and/or defined by other transmissiontiming structures. Such transmission timing structures may define atiming grid, e.g., with symbol time intervals within individualstructures representing the smallest timing units. Such a timing gridmay for example be defined by slots or subframes (wherein in some cases,subframes may be considered specific variants of slots). A transmissiontiming structure may have a duration (length in time) determined basedon the durations of its symbols, possibly in addition to cyclicprefix/es used. The symbols of a transmission timing structure may havethe same duration, or may in some variants have different duration. Thenumber of symbols in a transmission timing structure may be predefinedand/or configured or configurable, and/or be dependent on numerology.The timing of a mini-slot may generally be configured or configurable,in particular by the network and/or a network node. The timing may beconfigurable to start and/or end at any symbol of the transmissiontiming structure, in particular one or more slots. Mini-slot basedcommunication or transmission may also be referred to as non-slot basedcommunication or transmission.

There is generally considered a program product comprising instructionsadapted for causing processing and/or control circuitry to carry outand/or control any method described herein, in particular when executedon the processing and/or control circuitry. Also, there is considered acarrier medium arrangement carrying and/or storing a program product asdescribed herein.

A carrier medium arrangement may comprise one or more carrier media.Generally, a carrier medium may be accessible and/or readable and/orreceivable by processing or control circuitry. Storing data and/or aprogram product and/or code may be seen as part of carrying data and/ora program product and/or code. A carrier medium generally may comprise aguiding/transporting medium and/or a storage medium. Aguiding/transporting medium may be adapted to carry and/or carry and/orstore signals, in particular electromagnetic signals and/or electricalsignals and/or magnetic signals and/or optical signals. A carriermedium, in particular a guiding/transporting medium, may be adapted toguide such signals to carry them. A carrier medium, in particular aguiding/transporting medium, may comprise the electromagnetic field,e.g. radio waves or microwaves, and/or optically transmissive material,e.g. glass fiber, and/or cable. A storage medium may comprise at leastone of a memory, which may be volatile or non-volatile, a buffer, acache, an optical disc, magnetic memory, flash memory, etc.

A system comprising one or more radio nodes as described herein, inparticular a network node and a user equipment, is described. The systemmay be a wireless communication system, and/or provide and/or representa radio access network.

Moreover, there may be generally considered a method of operating aninformation system, the method comprising providing information.Alternatively, or additionally, an information system adapted forproviding information may be considered. Providing information maycomprise providing information for, and/or to, a target system, whichmay comprise and/or be implemented as radio access network and/or aradio node, in particular a network node or user equipment or terminal.Providing information may comprise transferring and/or streaming and/orsending and/or passing on the information, and/or offering theinformation for such and/or for download, and/or triggering suchproviding, e.g. by triggering a different system or node to streamand/or transfer and/or send and/or pass on the information. Theinformation system may comprise, and/or be connected or connectable to,a target, for example via one or more intermediate systems, e.g. a corenetwork and/or internet and/or private or local network. Information maybe provided utilising and/or via such intermediate system/s. Providinginformation may be for radio transmission and/or for transmission via anair interface and/or utilising a RAN or radio node as described herein.Connecting the information system to a target, and/or providinginformation, may be based on a target indication, and/or adaptive to atarget indication. A target indication may indicate the target, and/orone or more parameters of transmission pertaining to the target and/orthe paths or connections over which the information is provided to thetarget. Such parameter/s may in particular pertain to the air interfaceand/or radio access network and/or radio node and/or network node.Example parameters may indicate for example type and/or nature of thetarget, and/or transmission capacity (e.g., data rate) and/or latencyand/or reliability and/or cost, respectively one or more estimatesthereof. The target indication may be provided by the target, ordetermined by the information system, e.g. based on information receivedfrom the target and/or historical information, and/or be provided by auser, for example a user operating the target or a device incommunication with the target, e.g. via the RAN and/or air interface.For example, a user may indicate on a user equipment communicating withthe information system that information is to be provided via a RAN,e.g. by selecting from a selection provided by the information system,for example on a user application or user interface, which may be a webinterface. An information system may comprise one or more informationnodes. An information node may generally comprise processing circuitryand/or communication circuitry. In particular, an information systemand/or an information node may be implemented as a computer and/or acomputer arrangement, e.g. a host computer or host computer arrangementand/or server or server arrangement. In some variants, an interactionserver (e.g., web server) of the information system may provide a userinterface, and based on user input may trigger transmitting and/orstreaming information provision to the user (and/or the target) fromanother server, which may be connected or connectable to the interactionserver and/or be part of the information system or be connected orconnectable thereto. The information may be any kind of data, inparticular data intended for a user of for use at a terminal, e.g. videodata and/or audio data and/or location data and/or interactive dataand/or game-related data and/or environmental data and/or technical dataand/or traffic data and/or vehicular data and/or circumstantial dataand/or operational data. The information provided by the informationsystem may be mapped to, and/or mappable to, and/or be intended formapping to, communication or data signaling and/or one or more datachannels as described herein (which may be signaling or channel/s of anair interface and/or used within a RAN and/or for radio transmission).It may be considered that the information is formatted based on thetarget indication and/or target, e.g. regarding data amount and/or datarate and/or data structure and/or timing, which in particular may bepertaining to a mapping to communication or data signaling and/or a datachannels. Mapping information to data signaling and/or data channel/smay be considered to refer to using the signaling/channel/s to carry thedata, e.g. on higher layers of communication, with thesignaling/channel/s underlying the transmission. A target indicationgenerally may comprise different components, which may have differentsources, and/or which may indicate different characteristics of thetarget and/or communication path/s thereto. A format of information maybe specifically selected, e.g. from a set of different formats, forinformation to be transmitted on an air interface and/or by a RAN asdescribed herein. This may be particularly pertinent since an airinterface may be limited in terms of capacity and/or of predictability,and/or potentially be cost sensitive. The format may be selected to beadapted to the transmission indication, which may in particular indicatethat a RAN or radio node as described herein is in the path (which maybe the indicated and/or planned and/or expected path) of informationbetween the target and the information system. A (communication) path ofinformation may represent the interface/s (e.g., air and/or cableinterfaces) and/or the intermediate system/s (if any), between theinformation system and/or the node providing or transferring theinformation, and the target, over which the information is, or is to be,passed on. A path may be (at least partly) undetermined when a targetindication is provided, and/or the information is provided/transferredby the information system, e.g. if an internet is involved, which maycomprise multiple, dynamically chosen paths. Information and/or a formatused for information may be packet-based, and/or be mapped, and/or bemappable and/or be intended for mapping, to packets. Alternatively, oradditionally, there may be considered a method for operating a targetdevice comprising providing a target indicating to an informationsystem. More alternatively, or additionally, a target device may beconsidered, the target device being adapted for providing a targetindication to an information system. In another approach, there may beconsidered a target indication tool adapted for, and/or comprising anindication module for, providing a target indication to an informationsystem. The target device may generally be a target as described above.A target indication tool may comprise, and/or be implemented as,software and/or application or app, and/or web interface or userinterface, and/or may comprise one or more modules for implementingactions performed and/or controlled by the tool. The tool and/or targetdevice may be adapted for, and/or the method may comprise, receiving auser input, based on which a target indicating may be determined and/orprovided. Alternatively, or additionally, the tool and/or target devicemay be adapted for, and/or the method may comprise, receivinginformation and/or communication signaling carrying information, and/oroperating on, and/or presenting (e.g., on a screen and/or as audio or asother form of indication), information. The information may be based onreceived information and/or communication signaling carryinginformation. Presenting information may comprise processing receivedinformation, e.g. decoding and/or transforming, in particular betweendifferent formats, and/or for hardware used for presenting. Operating oninformation may be independent of or without presenting, and/or proceedor succeed presenting, and/or may be without user interaction or evenuser reception, for example for automatic processes, or target deviceswithout (e.g., regular) user interaction like MTC devices, of forautomotive or transport or industrial use. The information orcommunication signaling may be expected and/or received based on thetarget indication. Presenting and/or operating on information maygenerally comprise one or more processing steps, in particular decodingand/or executing and/or interpreting and/or transforming information.Operating on information may generally comprise relaying and/ortransmitting the information, e.g. on an air interface, which mayinclude mapping the information onto signaling (such mapping maygenerally pertain to one or more layers, e.g. one or more layers of anair interface, e.g. RLC (Radio Link Control) layer and/or MAC layerand/or physical layer/s). The information may be imprinted (or mapped)on communication signaling based on the target indication, which maymake it particularly suitable for use in a RAN (e.g., for a targetdevice like a network node or in particular a UE or terminal). The toolmay generally be adapted for use on a target device, like a UE orterminal. Generally, the tool may provide multiple functionalities, e.g.for providing and/or selecting the target indication, and/or presenting,e.g. video and/or audio, and/or operating on and/or storing receivedinformation. Providing a target indication may comprise transmitting ortransferring the indication as signaling, and/or carried on signaling,in a RAN, for example if the target device is a UE, or the tool for aUE. It should be noted that such provided information may be transferredto the information system via one or more additionally communicationinterfaces and/or paths and/or connections. The target indication may bea higher-layer indication and/or the information provided by theinformation system may be higher-layer information, e.g. applicationlayer or user-layer, in particular above radio layers like transportlayer and physical layer. The target indication may be mapped onphysical layer radio signaling, e.g. related to or on the user-plane,and/or the information may be mapped on physical layer radiocommunication signaling, e.g. related to or on the user-plane (inparticular, in reverse communication directions). The describedapproaches allow a target indication to be provided, facilitatinginformation to be provided in a specific format particularly suitableand/or adapted to efficiently use an air interface. A user input may forexample represent a selection from a plurality of possible transmissionmodes or formats, and/or paths, e.g. in terms of data rate and/orpackaging and/or size of information to be provided by the informationsystem.

In general, a numerology and/or subcarrier spacing may indicate thebandwidth (in frequency domain) of a subcarrier of a carrier, and/or thenumber of subcarriers in a carrier and/or the numbering of thesubcarriers in a carrier. Different numerologies may in particular bedifferent in the bandwidth of a subcarrier. In some variants, all thesubcarriers in a carrier have the same bandwidth associated to them. Thenumerology and/or subcarrier spacing may be different between carriersin particular regarding the subcarrier bandwidth. A symbol time length,and/or a time length of a timing structure pertaining to a carrier maybe dependent on the carrier frequency, and/or the subcarrier spacingand/or the numerology. In particular, different numerologies may havedifferent symbol time lengths.

Signaling may generally comprise one or more symbols and/or signalsand/or messages. A signal may comprise or represent one or more bits. Anindication may represent signaling, and/or be implemented as a signal,or as a plurality of signals. One or more signals may be included inand/or represented by a message. Signaling, in particular controlsignaling, may comprise a plurality of signals and/or messages, whichmay be transmitted on different carriers and/or be associated todifferent signaling processes, e.g. representing and/or pertaining toone or more such processes and/or corresponding information. Anindication may comprise signaling, and/or a plurality of signals and/ormessages and/or may be comprised therein, which may be transmitted ondifferent carriers and/or be associated to different acknowledgementsignaling processes, e.g. representing and/or pertaining to one or moresuch processes. Signaling associated to a channel may be transmittedsuch that represents signaling and/or information for that channel,and/or that the signaling is interpreted by the transmitter and/orreceiver to belong to that channel. Such signaling may generally complywith transmission parameters and/or format/s for the channel.

Reference signaling may be signaling comprising one or more referencesymbols and/or structures. Reference signaling may be adapted forgauging and/or estimating and/or representing transmission conditions,e.g. channel conditions and/or transmission path conditions and/orchannel (or signal or transmission) quality. It may be considered thatthe transmission characteristics (e.g., signal strength and/or formand/or modulation and/or timing) of reference signaling are availablefor both transmitter and receiver of the signaling (e.g., due to beingpredefined and/or configured or configurable and/or being communicated).Different types of reference signaling may be considered, e.g.pertaining to uplink, downlink or sidelink, cell-specific (inparticular, cell-wide, e.g., CRS) or device or user specific (addressedto a specific target or user equipment, e.g., CSI-RS),demodulation-related (e.g., DMRS) and/or signal strength related, e.g.power-related or energy-related or amplitude-related (e.g., SRS or pilotsignaling) and/or phase-related, etc.

An antenna arrangement may comprise one or more antenna elements(radiating elements), which may be combined in antenna arrays. Anantenna array or subarray may comprise one antenna element, or aplurality of antenna elements, which may be arranged e.g. twodimensionally (for example, a panel) or three dimensionally. It may beconsidered that each antenna array or subarray or element is separatelycontrollable, respectively that different antenna arrays arecontrollable separately from each other. A single antennaelement/radiator may be considered the smallest example of a subarray.Examples of antenna arrays comprise one or more multi-antenna panels orone or more individually controllable antenna elements. An antennaarrangement may comprise a plurality of antenna arrays. It may beconsidered that an antenna arrangement is associated to a (specificand/or single) radio node, e.g. a configuring or informing or schedulingradio node, e.g. to be controlled or controllable by the radio node. Anantenna arrangements associated to a UE or terminal may be smaller(e.g., in size and/or number of antenna elements or arrays) than theantenna arrangement associated to a network node. Antenna elements of anantenna arrangement may be configurable for different arrays, e.g. tochange the beam forming characteristics. In particular, antenna arraysmay be formed by combining one or more independently or separatelycontrollable antenna elements or subarrays. The beams may be provided byanalog beamforming, or in some variants by digital beamforming.

The informing radio nodes may be configured with the manner of beamtransmission, e.g. by transmitting a corresponding indicator orindication, for example as beam identify indication. However, there maybe considered cases in which the informing radio node/s are notconfigured with such information, and/or operate transparently, notknowing the way of beamforming used. An antenna arrangement may beconsidered separately controllable in regard to the phase and/oramplitude/power and/or gain of a signal feed to it for transmission,and/or separately controllable antenna arrangements may comprise anindependent or separate transmit and/or receive unit and/or ADC(Analog-Digital-Converter, alternatively an ADC chain) to convertdigital control information into an analog antenna feed for the wholeantenna arrangement (the ADC may be considered part of, and/or connectedor connectable to, antenna circuitry). A scenario in which each antennaelement is individually controllable may be referred to as digitalbeamforming, whereas a scenario in which larger arrays/subarrays areseparately controllable may be considered an example of analogbeamforming. Hybrid forms may be considered.

Uplink or sidelink signaling may be OFDMA (Orthogonal Frequency DivisionMultiple Access) or SC-FDMA (Single Carrier Frequency Division MultipleAccess) signaling. Downlink signaling may in particular be OFDMAsignaling. However, signaling is not limited thereto (Filter-Bank basedsignaling may be considered one alternative).

A radio node may generally be considered a device or node adapted forwireless and/or radio (and/or microwave) frequency communication, and/orfor communication utilising an air interface, e.g. according to acommunication standard.

A radio node may be a network node, or a user equipment or terminal. Anetwork node may be any radio node of a wireless communication network,e.g. a base station and/or gNodeB (gNB) and/or eNodeB (eNB) and/or relaynode and/or micro/nano/pico/femto node and/or transmission point (TP)and/or access point (AP) and/or other node, in particular for a RAN asdescribed herein.

The terms wireless device, user equipment (UE) and terminal may beconsidered to be interchangeable in the context of this disclosure. Awireless device, user equipment or terminal may represent an end devicefor communication utilising the wireless communication network, and/orbe implemented as a user equipment according to a standard. Examples ofuser equipments may comprise a phone like a smartphone, a personalcommunication device, a mobile phone or terminal, a computer, inparticular laptop, a sensor or machine with radio capability (and/oradapted for the air interface), in particular for MTC(Machine-Type-Communication, sometimes also referred to M2M,Machine-To-Machine), or a vehicle adapted for wireless communication. Auser equipment or terminal may be mobile or stationary.

A radio node may generally comprise processing circuitry and/or radiocircuitry. A radio node, in particular a network node, may in some casescomprise cable circuitry and/or communication circuitry, with which itmay be connected or connectable to another radio node and/or a corenetwork.

Circuitry may comprise integrated circuitry. Processing circuitry maycomprise one or more processors and/or controllers (e.g.,microcontrollers), and/or ASICs (Application Specific IntegratedCircuitry) and/or FPGAs (Field Programmable Gate Array), or similar. Itmay be considered that processing circuitry comprises, and/or is(operatively) connected or connectable to one or more memories or memoryarrangements. A memory arrangement may comprise one or more memories. Amemory may be adapted to store digital information. Examples formemories comprise volatile and non-volatile memory, and/or Random AccessMemory (RAM), and/or Read-Only-Memory (ROM), and/or magnetic and/oroptical memory, and/or flash memory, and/or hard disk memory, and/orEPROM or EEPROM (Erasable Programmable ROM or Electrically ErasableProgrammable ROM).

Radio circuitry may comprise one or more transmitters and/or receiversand/or transceivers (a transceiver may operate or be operable astransmitter and receiver, and/or may comprise joint or separatedcircuitry for receiving and transmitting, e.g. in one package orhousing), and/or may comprise one or more amplifiers and/or oscillatorsand/or filters, and/or may comprise, and/or be connected or connectableto antenna circuitry and/or one or more antennas and/or antenna arrays.An antenna array may comprise one or more antennas, which may bearranged in a dimensional array, e.g. 2D or 3D array, and/or antennapanels. A remote radio head (RRH) may be considered as an example of anantenna array. However, in some variants, a RRH may be also beimplemented as a network node, depending on the kind of circuitry and/orfunctionality implemented therein.

Communication circuitry may comprise radio circuitry and/or cablecircuitry. Communication circuitry generally may comprise one or moreinterfaces, which may be air interface/s and/or cable interface/s and/oroptical interface/s, e.g. laser-based. Interface/s may be in particularpacket-based. Cable circuitry and/or a cable interfaces may comprise,and/or be connected or connectable to, one or more cables (e.g., opticalfiber-based and/or wire-based), which may be directly or indirectly(e.g., via one or more intermediate systems and/or interfaces) beconnected or connectable to a target, e.g. controlled by communicationcircuitry and/or processing circuitry.

Any one or all of the modules disclosed herein may be implemented insoftware and/or firmware and/or hardware. Different modules may beassociated to different components of a radio node, e.g. differentcircuitries or different parts of a circuitry. It may be considered thata module is distributed over different components and/or circuitries. Aprogram product as described herein may comprise the modules related toa device on which the program product is intended (e.g., a userequipment or network node) to be executed (the execution may beperformed on, and/or controlled by the associated circuitry).

A radio access network may be a wireless communication network, and/or aRadio Access Network (RAN) in particular according to a communicationstandard. A communication standard may in particular a standardaccording to 3GPP and/or 5G, e.g. according to NR or LTE, in particularLTE Evolution.

A wireless communication network may be and/or comprise a Radio AccessNetwork (RAN), which may be and/or comprise any kind of cellular and/orwireless radio network, which may be connected or connectable to a corenetwork. The approaches described herein are particularly suitable for a5G network, e.g. LTE Evolution and/or NR (New Radio), respectivelysuccessors thereof. A RAN may comprise one or more network nodes, and/orone or more terminals, and/or one or more radio nodes. A network nodemay in particular be a radio node adapted for radio and/or wirelessand/or cellular communication with one or more terminals. A terminal maybe any device adapted for radio and/or wireless and/or cellularcommunication with or within a RAN, e.g. a user equipment (UE) or mobilephone or smartphone or computing device or vehicular communicationdevice or device for machine-type-communication (MTC), etc. A terminalmay be mobile, or in some cases stationary. A RAN or a wirelesscommunication network may comprise at least one network node and a UE,or at least two radio nodes. There may be generally considered awireless communication network or system, e.g. a RAN or RAN system,comprising at least one radio node, and/or at least one network node andat least one terminal.

Transmitting in downlink may pertain to transmission from the network ornetwork node to the terminal. Transmitting in uplink may pertain totransmission from the terminal to the network or network node.Transmitting in sidelink may pertain to (direct) transmission from oneterminal to another. Uplink, downlink and sidelink (e.g., sidelinktransmission and reception) may be considered communication directions.In some variants, uplink and downlink may also be used to describedwireless communication between network nodes, e.g. for wireless backhauland/or relay communication and/or (wireless) network communication forexample between base stations or similar network nodes, in particularcommunication terminating at such. It may be considered that backhauland/or relay communication and/or network communication is implementedas a form of sidelink or uplink communication or similar thereto.

Control information or a control information message or correspondingsignaling (control signaling) may be transmitted on a control channel,e.g. a physical control channel, which may be a downlink channel or (ora sidelink channel in some cases, e.g. one UE scheduling another UE).For example, control information/allocation information may be signaledby a network node on PDCCH (Physical Downlink Control Channel) and/or aPDSCH (Physical Downlink Shared Channel) and/or a HARQ-specific channel.Acknowledgement signaling, e.g. as a form of control information orsignaling like uplink control information/signaling, may be transmittedby a terminal on a PUCCH (Physical Uplink Control Channel) and/or PUSCH(Physical Uplink Shared Channel) and/or a HARQ-specific channel.Multiple channels may apply for multi-component/multi-carrier indicationor signaling.

Signaling may generally be considered to represent an electromagneticwave structure (e.g., over a time interval and frequency interval),which is intended to convey information to at least one specific orgeneric (e.g., anyone who might pick up the signaling) target. A processof signaling may comprise transmitting the signaling. Transmittingsignaling, in particular control signaling or communication signaling,e.g. comprising or representing acknowledgement signaling and/orresource requesting information, may comprise encoding and/ormodulating. Encoding and/or modulating may comprise error detectioncoding and/or forward error correction encoding and/or scrambling.Receiving control signaling may comprise corresponding decoding and/ordemodulation. Error detection coding may comprise, and/or be based on,parity or checksum approaches, e.g. CRC (Cyclic Redundancy Check).Forward error correction coding may comprise and/or be based on forexample turbo coding and/or Reed-Muller coding, and/or polar codingand/or LDPC coding (Low Density Parity Check). The type of coding usedmay be based on the channel (e.g., physical channel) the coded signal isassociated to. A code rate may represent the ratio of the number ofinformation bits before encoding to the number of encoded bits afterencoding, considering that encoding adds coding bits for error detectioncoding and forward error correction.

Communication signaling may comprise, and/or represent, and/or beimplemented as, data signaling, and/or user plane signaling.Communication signaling may be associated to a data channel, e.g. aphysical downlink channel or physical uplink channel or physicalsidelink channel, in particular a PDSCH (Physical Downlink SharedChannel) or PSSCH (Physical Sidelink Shared Channel). Generally, a datachannel may be a shared channel or a dedicated channel. Data signalingmay be signaling associated to and/or on a data channel.

An indication generally may explicitly and/or implicitly indicate theinformation it represents and/or indicates. Implicit indication may forexample be based on position and/or resource used for transmission.Explicit indication may for example be based on a parametrisation withone or more parameters, and/or one or more index or indices, and/or oneor more bit patterns representing the information. It may in particularbe considered that control signaling as described herein, based on theutilised resource sequence, implicitly indicates the control signalingtype.

A resource element may generally describe the smallest individuallyusable and/or encodable and/or decodable and/or modulatable and/ordemodulatable time-frequency resource, and/or may describe atime-frequency resource covering a symbol time length in time and asubcarrier in frequency. A signal may be allocatable and/or allocated toa resource element. A subcarrier may be a subband of a carrier, e.g. asdefined by a standard. A carrier may define a frequency and/or frequencyband for transmission and/or reception. In some variants, a signal(jointly encoded/modulated) may cover more than one resource elements. Aresource element may generally be as defined by a correspondingstandard, e.g. NR or LTE. As symbol time length and/or subcarrierspacing (and/or numerology) may be different between different symbolsand/or subcarriers, different resource elements may have differentextension (length/width) in time and/or frequency domain, in particularresource elements pertaining to different carriers.

A resource generally may represent a time-frequency and/or coderesource, on which signaling, e.g. according to a specific format, maybe communicated, for example transmitted and/or received, and/or beintended for transmission and/or reception.

A border symbol may generally represent a starting symbol or an endingsymbol for transmitting and/or receiving. A starting symbol may inparticular be a starting symbol of uplink or sidelink signaling, forexample control signaling or data signaling. Such signaling may be on adata channel or control channel, e.g. a physical channel, in particulara physical uplink shared channel (like PUSCH) or a sidelink data orshared channel, or a physical uplink control channel (like PUCCH) or asidelink control channel. If the starting symbol is associated tocontrol signaling (e.g., on a control channel), the control signalingmay be in response to received signaling (in sidelink or downlink), e.g.representing acknowledgement signaling associated thereto, which may beHARQ or ARQ signaling. An ending symbol may represent an ending symbol(in time) of downlink or sidelink transmission or signaling, which maybe intended or scheduled for the radio node or user equipment. Suchdownlink signaling may in particular be data signaling, e.g. on aphysical downlink channel like a shared channel, e.g. a PDSCH (PhysicalDownlink Shared Channel). A starting symbol may be determined based on,and/or in relation to, such an ending symbol.

Configuring a radio node, in particular a terminal or user equipment,may refer to the radio node being adapted or caused or set and/orinstructed to operate according to the configuration. Configuring may bedone by another device, e.g., a network node (for example, a radio nodeof the network like a base station or eNodeB) or network, in which caseit may comprise transmitting configuration data to the radio node to beconfigured. Such configuration data may represent the configuration tobe configured and/or comprise one or more instruction pertaining to aconfiguration, e.g. a configuration for transmitting and/or receiving onallocated resources, in particular frequency resources. A radio node mayconfigure itself, e.g., based on configuration data received from anetwork or network node. A network node may utilise, and/or be adaptedto utilise, its circuitry/ies for configuring. Allocation informationmay be considered a form of configuration data. Configuration data maycomprise and/or be represented by configuration information, and/or oneor more corresponding indications and/or message/s

Generally, configuring may include determining configuration datarepresenting the configuration and providing, e.g. transmitting, it toone or more other nodes (parallel and/or sequentially), which maytransmit it further to the radio node (or another node, which may berepeated until it reaches the wireless device). Alternatively, oradditionally, configuring a radio node, e.g., by a network node or otherdevice, may include receiving configuration data and/or data pertainingto configuration data, e.g., from another node like a network node,which may be a higher-level node of the network, and/or transmittingreceived configuration data to the radio node. Accordingly, determininga configuration and transmitting the configuration data to the radionode may be performed by different network nodes or entities, which maybe able to communicate via a suitable interface, e.g., an X2 interfacein the case of LTE or a corresponding interface for NR. Configuring aterminal may comprise scheduling downlink and/or uplink transmissionsfor the terminal, e.g. downlink data and/or downlink control signalingand/or DCI and/or uplink control or data or communication signaling, inparticular acknowledgement signaling, and/or configuring resourcesand/or a resource pool therefor.

A resource structure may be considered to be neighbored in frequencydomain by another resource structure, if they share a common borderfrequency, e.g. one as an upper frequency border and the other as alower frequency border. Such a border may for example be represented bythe upper end of a bandwidth assigned to a subcarrier n, which alsorepresents the lower end of a bandwidth assigned to a subcarrier n+1. Aresource structure may be considered to be neighbored in time domain byanother resource structure, if they share a common border time, e.g. oneas an upper (or right in the figures) border and the other as a lower(or left in the figures) border. Such a border may for example berepresented by the end of the symbol time interval assigned to a symboln, which also represents the beginning of a symbol time intervalassigned to a symbol n+1.

Generally, a resource structure being neighbored by another resourcestructure in a domain may also be referred to as abutting and/orbordering the other resource structure in the domain.

A resource structure may general represent a structure in time and/orfrequency domain, in particular representing a time interval and afrequency interval. A resource structure may comprise and/or becomprised of resource elements, and/or the time interval of a resourcestructure may comprise and/or be comprised of symbol time interval/s,and/or the frequency interval of a resource structure may compriseand/or be comprised of subcarrier/s. A resource element may beconsidered an example for a resource structure, a slot or mini-slot or aPhysical Resource Block (PRB) or parts thereof may be considered others.A resource structure may be associated to a specific channel, e.g. aPUSCH or PUCCH, in particular resource structure smaller than a slot orPRB.

Examples of a resource structure in frequency domain comprise abandwidth or band, or a bandwidth part. A bandwidth part may be a partof a bandwidth available for a radio node for communicating, e.g. due tocircuitry and/or configuration and/or regulations and/or a standard. Abandwidth part may be configured or configurable to a radio node. Insome variants, a bandwidth part may be the part of a bandwidth used forcommunicating, e.g. transmitting and/or receiving, by a radio node. Thebandwidth part may be smaller than the bandwidth (which may be a devicebandwidth defined by the circuitry/configuration of a device, and/or asystem bandwidth, e.g. available for a RAN). It may be considered that abandwidth part comprises one or more resource blocks or resource blockgroups, in particular one or more PRBs or PRB groups. A bandwidth partmay pertain to, and/or comprise, one or more carriers.

A carrier may generally represent a frequency range or band and/orpertain to a central frequency and an associated frequency interval. Itmay be considered that a carrier comprises a plurality of subcarriers. Acarrier may have assigned to it a central frequency or center frequencyinterval, e.g. represented by one or more subcarriers (to eachsubcarrier there may be generally assigned a frequency bandwidth orinterval). Different carriers may be non-overlapping, and/or may beneighboring in frequency domain.

It should be noted that the term “radio” in this disclosure may beconsidered to pertain to wireless communication in general, and may alsoinclude wireless communication utilising microwave and/or millimeterand/or other frequencies, in particular between 100 MHz or 1 GHz, and100 GHz or 20 or 10 GHz. Such communication may utilise one or morecarriers.

A radio node, in particular a network node or a terminal, may generallybe any device adapted for transmitting and/or receiving radio and/orwireless signals and/or data, in particular communication data, inparticular on at least one carrier. The at least one carrier maycomprise a carrier accessed based on a LBT procedure (which may becalled LBT carrier), e.g., an unlicensed carrier. It may be consideredthat the carrier is part of a carrier aggregate.

Receiving or transmitting on a cell or carrier may refer to receiving ortransmitting utilizing a frequency (band) or spectrum associated to thecell or carrier. A cell may generally comprise and/or be defined by orfor one or more carriers, in particular at least one carrier for ULcommunication/transmission (called UL carrier) and at least one carrierfor DL communication/transmission (called DL carrier). It may beconsidered that a cell comprises different numbers of UL carriers and DLcarriers. Alternatively, or additionally, a cell may comprise at leastone carrier for UL communication/transmission and DLcommunication/transmission, e.g., in TDD-based approaches.

A channel may generally be a logical, transport or physical channel. Achannel may comprise and/or be arranged on one or more carriers, inparticular a plurality of subcarriers. A channel carrying and/or forcarrying control signaling/control information may be considered acontrol channel, in particular if it is a physical layer channel and/orif it carries control plane information. Analogously, a channel carryingand/or for carrying data signaling/user information may be considered adata channel, in particular if it is a physical layer channel and/or ifit carries user plane information. A channel may be defined for aspecific communication direction, or for two complementary communicationdirections (e.g., UL and DL, or sidelink in two directions), in whichcase it may be considered to have two component channels, one for eachdirection. Examples of channels comprise a channel for low latencyand/or high reliability transmission, in particular a channel forUltra-Reliable Low Latency Communication (URLLC), which may be forcontrol and/or data.

In general, a symbol may represent and/or be associated to a symbol timelength, which may be dependent on the carrier and/or subcarrier spacingand/or numerology of the associated carrier. Accordingly, a symbol maybe considered to indicate a time interval having a symbol time length inrelation to frequency domain. A symbol time length may be dependent on acarrier frequency and/or bandwidth and/or numerology and/or subcarrierspacing of, or associated to, a symbol. Accordingly, different symbolsmay have different symbol time lengths. In particular, numerologies withdifferent subcarrier spacings may have different symbol time length.Generally, a symbol time length may be based on, and/or include, a guardtime interval or cyclic extension, e.g. prefix or postfix.

A sidelink may generally represent a communication channel (or channelstructure) between two UEs and/or terminals, in which data istransmitted between the participants (UEs and/or terminals) via thecommunication channel, e.g. directly and/or without being relayed via anetwork node. A sidelink may be established only and/or directly via airinterface/s of the participant, which may be directly linked via thesidelink communication channel. In some variants, sidelink communicationmay be performed without interaction by a network node, e.g. on fixedlydefined resources and/or on resources negotiated between theparticipants. Alternatively, or additionally, it may be considered thata network node provides some control functionality, e.g. by configuringresources, in particular one or more resource pool/s, for sidelinkcommunication, and/or monitoring a sidelink, e.g. for charging purposes.

Sidelink communication may also be referred to as device-to-device (D2D)communication, and/or in some cases as ProSe (Proximity Services)communication, e.g. in the context of LTE. A sidelink may be implementedin the context of V2x communication (Vehicular communication), e.g. V2V(Vehicle-to-Vehicle), V2I (Vehicle-to-Infrastructure) and/or V2P(Vehicle-to-Person). Any device adapted for sidelink communication maybe considered a user equipment or terminal.

A sidelink communication channel (or structure) may comprise one or more(e.g., physical or logical) channels, e.g. a PSCCH (Physical SidelinkControl CHannel, which may for example carry control information like anacknowledgement position indication, and/or a PSSCH (Physical SidelinkShared CHannel, which for example may carry data and/or acknowledgementsignaling). It may be considered that a sidelink communication channel(or structure) pertains to and/or used one or more carrier/s and/orfrequency range/s associated to, and/or being used by, cellularcommunication, e.g. according to a specific license and/or standard.Participants may share a (physical) channel and/or resources, inparticular in frequency domain and/or related to a frequency resourcelike a carrier) of a sidelink, such that two or more participantstransmit thereon, e.g. simultaneously, and/or time-shifted, and/or theremay be associated specific channels and/or resources to specificparticipants, so that for example only one participant transmits on aspecific channel or on a specific resource or specific resources, e.g.,in frequency domain and/or related to one or more carriers orsubcarriers.

A sidelink may comply with, and/or be implemented according to, aspecific standard, e.g. a LTE-based standard and/or NR. A sidelink mayutilise TDD (Time Division Duplex) and/or FDD (Frequency DivisionDuplex) technology, e.g. as configured by a network node, and/orpreconfigured and/or negotiated between the participants. A userequipment may be considered to be adapted for sidelink communication ifit, and/or its radio circuitry and/or processing circuitry, is adaptedfor utilising a sidelink, e.g. on one or more frequency ranges and/orcarriers and/or in one or more formats, in particular according to aspecific standard. It may be generally considered that a Radio AccessNetwork is defined by two participants of a sidelink communication.Alternatively, or additionally, a Radio Access Network may berepresented, and/or defined with, and/or be related to a network nodeand/or communication with such a node.

Communication or communicating may generally comprise transmittingand/or receiving signaling. Communication on a sidelink (or sidelinksignaling) may comprise utilising the sidelink for communication(respectively, for signaling). Sidelink transmission and/or transmittingon a sidelink may be considered to comprise transmission utilising thesidelink, e.g. associated resources and/or transmission formats and/orcircuitry and/or the air interface. Sidelink reception and/or receivingon a sidelink may be considered to comprise reception utilising thesidelink, e.g. associated resources and/or transmission formats and/orcircuitry and/or the air interface. Sidelink control information (e.g.,SCI) may generally be considered to comprise control informationtransmitted utilising a sidelink.

Generally, carrier aggregation (CA) may refer to the concept of a radioconnection and/or communication link between a wireless and/or cellularcommunication network and/or network node and a terminal or on asidelink comprising a plurality of carriers for at least one directionof transmission (e.g. DL and/or UL), as well as to the aggregate ofcarriers. A corresponding communication link may be referred to ascarrier aggregated communication link or CA communication link; carriersin a carrier aggregate may be referred to as component carriers (CC). Insuch a link, data may be transmitted over more than one of the carriersand/or all the carriers of the carrier aggregation (the aggregate ofcarriers). A carrier aggregation may comprise one (or more) dedicatedcontrol carriers and/or primary carriers (which may e.g. be referred toas primary component carrier or PCC), over which control information maybe transmitted, wherein the control information may refer to the primarycarrier and other carriers, which may be referred to as secondarycarriers (or secondary component carrier, SCC). However, in someapproaches, control information may be send over more than one carrierof an aggregate, e.g. one or more PCCs and one PCC and one or more SCCs.

A transmission may generally pertain to a specific channel and/orspecific resources, in particular with a starting symbol and endingsymbol in time, covering the interval therebetween. A scheduledtransmission may be a transmission scheduled and/or expected and/or forwhich resources are scheduled or provided or reserved. However, notevery scheduled transmission has to be realized. For example, ascheduled downlink transmission may not be received, or a scheduleduplink transmission may not be transmitted due to power limitations, orother influences (e.g., a channel on an unlicensed carrier beingoccupied). A transmission may be scheduled for a transmission timingsubstructure (e.g., a mini-slot, and/or covering only a part of atransmission timing structure) within a transmission timing structurelike a slot. A border symbol may be indicative of a symbol in thetransmission timing structure at which the transmission starts or ends.

Predefined in the context of this disclosure may refer to the relatedinformation being defined for example in a standard, and/or beingavailable without specific configuration from a network or network node,e.g. stored in memory, for example independent of being configured.Configured or configurable may be considered to pertain to thecorresponding information being set/configured, e.g. by the network or anetwork node.

A configuration or schedule, like a mini-slot configuration and/orstructure configuration, may schedule transmissions, e.g. for thetime/transmissions it is valid, and/or transmissions may be scheduled byseparate signaling or separate configuration, e.g. separate RRCsignaling and/or downlink control information signaling. Thetransmission/s scheduled may represent signaling to be transmitted bythe device for which it is scheduled, or signaling to be received by thedevice for which it is scheduled, depending on which side of acommunication the device is. It should be noted that downlink controlinformation or specifically DCI signaling may be considered physicallayer signaling, in contrast to higher layer signaling like MAC (MediumAccess Control) signaling or RRC layer signaling. The higher the layerof signaling is, the less frequent/the more time/resource consuming itmay be considered, at least partially due to the information containedin such signaling having to be passed on through several layers, eachlayer requiring processing and handling.

A scheduled transmission, and/or transmission timing structure like amini-slot or slot, may pertain to a specific channel, in particular aphysical uplink shared channel, a physical uplink control channel, or aphysical downlink shared channel, e.g. PUSCH, PUCCH or PDSCH, and/or maypertain to a specific cell and/or carrier aggregation. A correspondingconfiguration, e.g. scheduling configuration or symbol configuration maypertain to such channel, cell and/or carrier aggregation. It may beconsidered that the scheduled transmission represents transmission on aphysical channel, in particular a shared physical channel, for example aphysical uplink shared channel or physical downlink shared channel. Forsuch channels, semi-persistent configuring may be particularly suitable.

Generally, a configuration may be a configuration indicating timing,and/or be represented or configured with corresponding configurationdata. A configuration may be embedded in, and/or comprised in, a messageor configuration or corresponding data, which may indicate and/orschedule resources, in particular semi-persistently and/orsemi-statically.

A control region of a transmission timing structure may be an intervalin time for intended or scheduled or reserved for control signaling, inparticular downlink control signaling, and/or for a specific controlchannel, e.g. a physical downlink control channel like PDCCH. Theinterval may comprise, and/or consist of, a number of symbols in time,which may be configured or configurable, e.g. by (UE-specific) dedicatedsignaling (which may be single-cast, for example addressed to orintended for a specific UE), e.g. on a PDCCH, or RRC signaling, or on amulticast or broadcast channel. In general, the transmission timingstructure may comprise a control region covering a configurable numberof symbols. It may be considered that in general the border symbol isconfigured to be after the control region in time.

The duration of a symbol (symbol time length or interval) of thetransmission timing structure may generally be dependent on a numerologyand/or carrier, wherein the numerology and/or carrier may beconfigurable. The numerology may be the numerology to be used for thescheduled transmission.

Scheduling a device, or for a device, and/or related transmission orsignaling, may be considered comprising, or being a form of, configuringthe device with resources, and/or of indicating to the device resources,e.g. to use for communicating. Scheduling may in particular pertain to atransmission timing structure, or a substructure thereof (e.g., a slotor a mini-slot, which may be considered a substructure of a slot). Itmay be considered that a border symbol may be identified and/ordetermined in relation to the transmission timing structure even if fora substructure being scheduled, e.g. if an underlying timing grid isdefined based on the transmission timing structure. Signaling indicatingscheduling may comprise corresponding scheduling information and/or beconsidered to represent or contain configuration data indicating thescheduled transmission and/or comprising scheduling information. Suchconfiguration data or signaling may be considered a resourceconfiguration or scheduling configuration. It should be noted that sucha configuration (in particular as single message) in some cases may notbe complete without other configuration data, e.g. configured with othersignaling, e.g. higher layer signaling. In particular, the symbolconfiguration may be provided in addition to scheduling/resourceconfiguration to identify exactly which symbols are assigned to ascheduled transmission. A scheduling (or resource) configuration mayindicate transmission timing structure/s and/or resource amount (e.g.,in number of symbols or length in time) for a scheduled transmission.

A scheduled transmission may be transmission scheduled, e.g. by thenetwork or network node. Transmission may in this context may be uplink(UL) or downlink (DL) or sidelink (SL) transmission. A device, e.g. auser equipment, for which the scheduled transmission is scheduled, mayaccordingly be scheduled to receive (e.g., in DL or SL), or to transmit(e.g. in UL or SL) the scheduled transmission. Scheduling transmissionmay in particular be considered to comprise configuring a scheduleddevice with resource/s for this transmission, and/or informing thedevice that the transmission is intended and/or scheduled for someresources. A transmission may be scheduled to cover a time interval, inparticular a successive number of symbols, which may form a continuousinterval in time between (and including) a starting symbol and an endingsymbols. The starting symbol and the ending symbol of a (e.g.,scheduled) transmission may be within the same transmission timingstructure, e.g. the same slot. However, in some cases, the ending symbolmay be in a later transmission timing structure than the startingsymbol, in particular a structure following in time. To a scheduledtransmission, a duration may be associated and/or indicated, e.g. in anumber of symbols or associated time intervals. In some variants, theremay be different transmissions scheduled in the same transmission timingstructure. A scheduled transmission may be considered to be associatedto a specific channel, e.g. a shared channel like PUSCH or PDSCH.

In the context of this disclosure, there may be distinguished betweendynamically scheduled or aperiodic transmission and/or configuration,and semi-static or semi-persistent or periodic transmission and/orconfiguration. The term “dynamic” or similar terms may generally pertainto configuration/transmission valid and/or scheduled and/or configuredfor (relatively) short timescales and/or a (e.g., predefined and/orconfigured and/or limited and/or definite) number of occurrences and/ortransmission timing structures, e.g. one or more transmission timingstructures like slots or slot aggregations, and/or for one or more(e.g., specific number) of transmission/occurrences. Dynamicconfiguration may be based on low-level signaling, e.g. controlsignaling on the physical layer and/or MAC layer, in particular in theform of DCI or SCI. Periodic/semi-static may pertain to longertimescales, e.g. several slots and/or more than one frame, and/or anon-defined number of occurrences, e.g., until a dynamic configurationcontradicts, or until a new periodic configuration arrives. A periodicor semi-static configuration may be based on, and/or be configured with,higher-layer signaling, in particular RCL layer signaling and/or RRCsignaling and/or MAC signaling.

A transmission timing structure may comprise a plurality of symbols,and/or define an interval comprising several symbols (respectively theirassociated time intervals). In the context of this disclosure, it shouldbe noted that a reference to a symbol for ease of reference may beinterpreted to refer to the time domain projection or time interval ortime component or duration or length in time of the symbol, unless it isclear from the context that the frequency domain component also has tobe considered. Examples of transmission timing structures include slot,subframe, mini-slot (which also may be considered a substructure of aslot), slot aggregation (which may comprise a plurality of slots and maybe considered a superstructure of a slot), respectively their timedomain component. A transmission timing structure may generally comprisea plurality of symbols defining the time domain extension (e.g.,interval or length or duration) of the transmission timing structure,and arranged neighboring to each other in a numbered sequence. A timingstructure (which may also be considered or implemented assynchronisation structure) may be defined by a succession of suchtransmission timing structures, which may for example define a timinggrid with symbols representing the smallest grid structures. Atransmission timing structure, and/or a border symbol or a scheduledtransmission may be determined or scheduled in relation to such a timinggrid. A transmission timing structure of reception may be thetransmission timing structure in which the scheduling control signalingis received, e.g. in relation to the timing grid. A transmission timingstructure may in particular be a slot or subframe or in some cases, amini-slot.

Feedback signaling may be considered a form or control signaling, e.g.uplink or sidelink control signaling, like UCI (Uplink ControlInformation) signaling or SCI (Sidelink Control Information) signaling.Feedback signaling may in particular comprise and/or representacknowledgement signaling and/or acknowledgement information and/ormeasurement reporting.

Acknowledgement information may comprise an indication of a specificvalue or state for an acknowledgement signaling process, e.g. ACK orNACK or DTX. Such an indication may for example represent a bit or bitvalue or bit pattern or an information switch. Different levels ofacknowledgement information, e.g. providing differentiated informationabout quality of reception and/or error position in received dataelement/s may be considered and/or represented by control signaling.Acknowledgment information may generally indicate acknowledgment ornon-acknowledgment or non-reception or different levels thereof, e.g.representing ACK or NACK or DTX. Acknowledgment information may pertainto one acknowledgement signaling process. Acknowledgement signaling maycomprise acknowledgement information pertaining to one or moreacknowledgement signaling processes, in particular one or more HARQ orARQ processes. It may be considered that to each acknowledgmentsignaling process the acknowledgement information pertains to, aspecific number of bits of the information size of the control signalingis assigned. Measurement reporting signaling may comprise measurementinformation.

Signaling may generally comprise one or more symbols and/or signalsand/or messages. A signal may comprise and/or represent one or morebits, which may be modulated into a common modulated signal. Anindication may represent signaling, and/or be implemented as a signal,or as a plurality of signals. One or more signals may be included inand/or represented by a message. Signaling, in particular controlsignaling, may comprise a plurality of signals and/or messages, whichmay be transmitted on different carriers and/or be associated todifferent acknowledgement signaling processes, e.g. representing and/orpertaining to one or more such processes. An indication may comprisesignaling and/or a plurality of signals and/or messages and/or may becomprised therein, which may be transmitted on different carriers and/orbe associated to different acknowledgement signaling processes, e.g.representing and/or pertaining to one or more such processes.

Signaling utilising, and/or on and/or associated to, resources or aresource structure may be signaling covering the resources or structure,signaling on the associated frequency/ies and/or in the associated timeinterval/s. It may be considered that a signaling resource structurecomprises and/or encompasses one or more substructures, which may beassociated to one or more different channels and/or types of signalingand/or comprise one or more holes (resource element/s not scheduled fortransmissions or reception of transmissions). A resource substructure,e.g. a feedback resource structure, may generally be continuous in timeand/or frequency, within the associated intervals. It may be consideredthat a substructure, in particular a feedback resource structure,represents a rectangle filled with one or more resource elements intime/frequency space. However, in some cases, a resource structure orsubstructure, in particular a frequency resource range, may represent anon-continuous pattern of resources in one or more domains, e.g. timeand/or frequency. The resource elements of a substructure may bescheduled for associated signaling.

It should generally be noted that the number of bits or a bit rateassociated to specific signaling that can be carried on a resourceelement may be based on a modulation and coding scheme (MCS). Thus, bitsor a bit rate may be seen as a form of resources representing a resourcestructure or range in frequency and/or time, e.g. depending on MCS. TheMCS may be configured or configurable, e.g. by control signaling, e.g.DCI or MAC (Medium Access Control) or RRC (Radio Resource Control)signaling. Different formats of for control information may beconsidered, e.g. different formats for a control channel like a PhysicalUplink Control Channel (PUCCH). PUCCH may carry control information orcorresponding control signaling, e.g. Uplink Control Information (UCI).UCI may comprise feedback signaling, and/or acknowledgement signalinglike HARQ feedback (ACK/NACK), and/or measurement information signaling,e.g. comprising Channel Quality Information (CQI), and/or SchedulingRequest (SR) signaling. One of the supported PUCCH formats may be short,and may e.g. occur at the end of a slot interval, and/or multiplexedand/or neighboring to PUSCH. Similar control information may be providedon a sidelink, e.g. as Sidelink Control Information (SCI), in particularon a (physical) sidelink control channel, like a (P)SCCH.

A code block may be considered a subelement of a data element like atransport block, e.g., a transport block may comprise a one or aplurality of code blocks.

A scheduling assignment may be configured with control signaling, e.g.downlink control signaling or sidelink control signaling. Such controlssignaling may be considered to represent and/or comprise schedulingsignaling, which may indicate scheduling information. A schedulingassignment may be considered scheduling information indicatingscheduling of signaling/transmission of signaling, in particularpertaining to signaling received or to be received by the deviceconfigured with the scheduling assignment. It may be considered that ascheduling assignment may indicate data (e.g., data block or elementand/or channel and/or data stream) and/or an (associated)acknowledgement signaling process and/or resource/s on which the data(or, in some cases, reference signaling) is to be received and/orindicate resource/s for associated feedback signaling, and/or a feedbackresource range on which associated feedback signaling is to betransmitted. Transmission associated to an acknowledgement signalingprocess, and/or the associated resources or resource structure, may beconfigured and/or scheduled, for example by a scheduling assignment.Different scheduling assignments may be associated to differentacknowledgement signaling processes. A scheduling assignment may beconsidered an example of downlink control information or signaling, e.g.if transmitted by a network node and/or provided on downlink (orsidelink control information if transmitted using a sidelink and/or by auser equipment).

A scheduling grant (e.g., uplink grant) may represent control signaling(e.g., downlink control information/signaling). It may be consideredthat a scheduling grant configures the signaling resource range and/orresources for uplink (or sidelink) signaling, in particular uplinkcontrol signaling and/or feedback signaling, e.g. acknowledgementsignaling. Configuring the signaling resource range and/or resources maycomprise configuring or scheduling it for transmission by the configuredradio node. A scheduling grant may indicate a channel and/or possiblechannels to be used/usable for the feedback signaling, in particularwhether a shared channel like a PUSCH may be used/is to be used. Ascheduling grant may generally indicate uplink resource/s and/or anuplink channel and/or a format for control information pertaining toassociated scheduling assignments. Both grant and assignment/s may beconsidered (downlink or sidelink) control information, and/or beassociated to, and/or transmitted with, different messages.

A resource structure in frequency domain (which may be referred to asfrequency interval and/or range) may be represented by a subcarriergrouping. A subcarrier grouping may comprise one or more subcarriers,each of which may represent a specific frequency interval, and/orbandwidth. The bandwidth of a subcarrier, the length of the interval infrequency domain, may be determined by the subcarrier spacing and/ornumerology. The subcarriers may be arranged such that each subcarrierneighbours at least one other subcarrier of the grouping in frequencyspace (for grouping sizes larger than 1). The subcarriers of a groupingmay be associated to the same carrier, e.g. configurably or configuredof predefined. A physical resource block may be consideredrepresentative of a grouping (in frequency domain). A subcarriergrouping may be considered to be associated to a specific channel and/ortype of signaling, it transmission for such channel or signaling isscheduled and/or transmitted and/or intended and/or configured for atleast one, or a plurality, or all subcarriers in the grouping. Suchassociation may be time-dependent, e.g. configured or configurable orpredefined, and/or dynamic or semi-static. The association may bedifferent for different devices, e.g. configured or configurable orpredefined, and/or dynamic or semi-static. Patterns of subcarriergroupings may be considered, which may comprise one or more subcarriergroupings (which may be associated to same or differentsignalings/channels), and/or one or more groupings without associatedsignaling (e.g., as seen from a specific device). An example of apattern is a comb, for which between pairs of groupings associated tothe same signaling/channel there are arranged one or more groupingsassociated to one or more different channels and/or signaling types,and/or one or more groupings without associated channel/signaling).

Example types of signaling comprise signaling of a specificcommunication direction, in particular, uplink signaling, downlinksignaling, sidelink signaling, as well as reference signaling (e.g., SRSor CRS or CSI-RS), communication signaling, control signaling, and/orsignaling associated to a specific channel like PUSCH, PDSCH, PUCCH,PDCCH, PSCCH, PSSCH, etc.).

In this disclosure, for purposes of explanation and not limitation,specific details are set forth (such as particular network functions,processes and signaling steps) in order to provide a thoroughunderstanding of the technique presented herein. It will be apparent toone skilled in the art that the present concepts and aspects may bepracticed in other variants and variants that depart from these specificdetails.

For example, the concepts and variants are partially described in thecontext of Long Term Evolution (LTE) or LTE-Advanced (LTE-A) or NewRadio mobile or wireless communications technologies; however, this doesnot rule out the use of the present concepts and aspects in connectionwith additional or alternative mobile communication technologies such asthe Global System for Mobile Communications (GSM). While describedvariants may pertain to certain Technical Specifications (TSs) of theThird Generation Partnership Project (3GPP), it will be appreciated thatthe present approaches, concepts and aspects could also be realized inconnection with different Performance Management (PM) specifications.

Moreover, those skilled in the art will appreciate that the services,functions and steps explained herein may be implemented using softwarefunctioning in conjunction with a programmed microprocessor, or using anApplication Specific Integrated Circuit (ASIC), a Digital SignalProcessor (DSP), a Field Programmable Gate Array (FPGA) or generalpurpose computer. It will also be appreciated that while the variantsdescribed herein are elucidated in the context of methods and devices,the concepts and aspects presented herein may also be embodied in aprogram product as well as in a system comprising control circuitry,e.g. a computer processor and a memory coupled to the processor, whereinthe memory is encoded with one or more programs or program products thatexecute the services, functions and steps disclosed herein.

It is believed that the advantages of the aspects and variants presentedherein will be fully understood from the foregoing description, and itwill be apparent that various changes may be made in the form,constructions and arrangement of the exemplary aspects thereof withoutdeparting from the scope of the concepts and aspects described herein orwithout sacrificing all of its advantageous effects. The aspectspresented herein can be varied in many ways.

Some useful abbreviations comprise

Abbreviation Explanation ACK/NACK Acknowledgment/NegativeAcknowledgement ARQ Automatic Repeat reQuest CAZAC Constant AmplitudeZero Cross Correlation CBG Code Block Group CDM Code Division MultiplexCM Cubic Metric CQI Channel Quality Information CRC Cyclic RedundancyCheck CRS Common reference signal CSI Channel State Information CSI-RSChannel state information reference signal DAI Downlink AssignmentIndicator DCI Downlink Control Information DFT Discrete FourierTransform DM(-)RS Demodulation reference signal(ing) FDD FrequencyDivision Duplex FDM Frequency Division Multiplex HARQ Hybrid AutomaticRepeat Request IFFT Inverse Fast Fourier Transform MBB Mobile BroadbandMCS Modulation and Coding Scheme MIMO Multiple-input-multiple-output MRCMaximum-ratio combining MRT Maximum-ratio transmission MU-MIMO Multiusermultiple-input-multiple-output OFDM/A Orthogonal Frequency DivisionMultiplex/Multiple Access PAPR Peak to Average Power Ratio PDCCHPhysical Downlink Control Channel PDSCH Physical Downlink Shared ChannelPRACH Physical Random Access CHannel PRB Physical Resource Block PUCCHPhysical Uplink Control Channel PUSCH Physical Uplink Shared Channel(P)SCCH (Physical) Sidelink Control Channel (P)SSCH (Physical) SidelinkShared Channel RB Resource Block RRC Radio Resource Control SC-FDM/ASingle Carrier Frequency Division Multiplex/Multiple Access SCI SidelinkControl Information SINR Signal-to-interference-plus-noise ratio SIRSignal-to-interference ratio SNR Signal-to-noise-ratio SR SchedulingRequest SRS Sounding Reference Signal(ing) SVD Singular-valuedecomposition TDD Time Division Duplex TDM Time Division Multiplex UCIUplink Control Information UE User Equipment URLLC Ultra Low LatencyHigh Reliability Communication VL-MIMO Very-largemultiple-input-multiple-output ZF Zero Forcing

Abbreviations may be considered to follow 3G PP usage if applicable.

1. A method of operating a user equipment in a radio access network, theuser equipment being configured with a transmission resource pool, thetransmission resource pool comprising resources for transmission ofresponse control signaling by the user equipment, the method comprising:transmitting response control signaling utilising a resource structure,the resource structure being selected from the transmission resourcepool based on a signaling characteristic of characterising signaling,the resource structure further being selected based on selection controlinformation included in a received selection control message.
 2. Themethod according to claim 1, wherein the transmission resource poolcomprises at least two different subpools, different subpools comprisingresources for different types of response control signaling.
 3. Themethod according to claim 1, wherein the signaling characteristic ofcharacterising signaling characterises at least one of: an end; a start;and a reference point of the signaling, in at least one of a time and afrequency domain.
 4. The method according to claim 1, wherein theselection control message is carried by the characterising signaling. 5.The method according to claim 1, wherein the response controlinformation is transmitted in response to at least one of the selectioncontrol message and the characterising signaling.
 6. The methodaccording to claim 1, wherein the signaling characteristic in includedin a message carried by control signaling.
 7. The method according toclaim 1, wherein the resource structure is selected based on the type ofresponse control signaling to be transmitted, and/or based on the typeof signaling it is in response to.
 8. The method according to claim 1,wherein the selection control message is a downlink control informationmessage, and wherein the characterising signaling carries the downlinkcontrol information message.
 9. The method according to claim 1, whereinthe selection control message indicates the signaling characteristic ofthe characterising signaling.
 10. The method according to claim 1,wherein the characterising signaling is data signaling.
 11. A computerstorage medium storing a computer program having instructions that, whenexecuted, cause processing circuitry to at least one of control andperform a method of operating a user equipment in a radio accessnetwork, the user equipment being configured with a transmissionresource pool, the transmission resource pool comprising resources fortransmission of response control signaling by the user equipment, themethod comprising: transmitting response control signaling utilising aresource structure, the resource structure being selected from thetransmission resource pool based on a signaling characteristic ofcharacterising signaling, the resource structure further being selectedbased on selection control information included in a received selectioncontrol message.
 12. A user equipment for a radio access network, theuser equipment being configured with a transmission resource pool, thetransmission resource pool comprising resources for transmission ofresponse control signaling by the user equipment, the user equipmentbeing configured to: transmit response control signaling utilising aresource structure, the resource structure being selected from thetransmission resource pool based on a signaling characteristic ofcharacterising signaling, the resource structure further being selectedbased on selection control information included in a received selectioncontrol message.
 13. A method of operating a radio node in a radioaccess network, the method comprising: receiving response controlsignaling from a responding radio node, the responding radio node beingconfigured with a transmission resource pool, the transmission resourcepool comprising resources for transmission of response control signalingby the responding radio node; and receiving response control signalingfrom the responding radio node utilising a resource structure, theresource structure being selected based on the transmission resourcepool and based on a signaling characteristic of characterisingsignaling, the resource structure further being selected based onselection control information included in a selection control messagetransmitted to the responding radio node.
 14. The method according toclaim 13, wherein the transmission resource pool comprises at least twodifferent subpools, different subpools comprising resources fordifferent types of response control signaling.
 15. The method accordingto claim 13, wherein the signaling characteristic of characterisingsignaling characterises at least one of: an end; a start; and areference point of the signaling, in at least one of a time and afrequency domain.
 16. The method according to claim 13, wherein theselection control message is carried by the characterising signaling.17. The method according to claim 13, wherein the response controlinformation is transmitted in response to at least one of the selectioncontrol message and the characterising signaling.
 18. The methodaccording to claim 13, wherein the signaling characteristic in includedin a message carried by control signaling.
 19. The method according toclaim 13, wherein the resource structure is selected based on the typeof response control signaling to be transmitted, and/or based on thetype of signaling it is in response to.
 20. A radio node for a radioaccess network, the radio node being configured to: receive responsecontrol signaling from a responding radio node, the responding radionode being configured with a transmission resource pool, thetransmission resource pool comprising resources for transmission ofresponse control signaling by the responding radio node; and receiveresponse control signaling from the responding radio node utilising aresource structure, the resource structure being selected based on thetransmission resource pool and based on a signaling characteristic ofcharacterising signaling, the resource structure further being selectedbased on selection control information included in a selection controlmessage transmitted to the responding radio node.